Effect of Water-Cement Ratio on Flexural Strength of RC Beams Made with Partial Replacement of Coarse Aggregates with Coarse Aggregates from Old Concrete

Authors

  • M. Oad Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
  • A. H. Buller Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
  • B. A. Memon Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
  • N. A. Memon Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
  • Z. A. Tunio Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
  • M. A. Memon Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
Volume: 9 | Issue: 1 | Pages: 3826-3831 | February 2019 | https://doi.org/10.48084/etasr.2499

Abstract

This research paper presents an experimental evaluation of the effect of water-cement ratio on the flexural strength of reinforced concrete beams made with 50% replacement of coarse aggregates with recycled concrete aggregates (RCA). 72 reinforced concrete beams were cast using 0.54, 0.6, 0.65 and 0.70 water-cement ratio. In each ratio, 12 beams were cast using RCA and 3 beams were cast using all-natural coarse aggregates (NCA). Beams were cured for 7 and 28 days. After curing, all beams were tested with central point load in a universal load testing machine. From the obtained results, it is observed that the maximum reduction in flexural strength of RCA beams is about 28% when compared to the 0.54 w/c ratio beams of the same group and 31.75% in comparison to NCA beams cast with same w/c ratio. The maximum deflection and average strain in beams remained within limits. The observed cracking pattern shows shear failure of all beams.

Keywords:

recycled concrete aggregates, green concrete, reinforced concrete, beams, flexural strength, water/cement ratiorecycled concrete aggregates, water/cement ratio

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How to Cite

[1]
Oad, M., Buller, A.H., Memon, B.A., Memon, N.A., Tunio, Z.A. and Memon, M.A. 2019. Effect of Water-Cement Ratio on Flexural Strength of RC Beams Made with Partial Replacement of Coarse Aggregates with Coarse Aggregates from Old Concrete. Engineering, Technology & Applied Science Research. 9, 1 (Feb. 2019), 3826–3831. DOI:https://doi.org/10.48084/etasr.2499.

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